What is the diameter of the shaft? Will it fit in a standard pin vise?

Diameter of the shaft is 1/8" or .125

Can I put these in a dremel tool?

Absolutely, but you have to remember these are extremely brittle. ANY side force will break the bit. You are best served using them in some sort of press but with very steady hands and a thoughtful method, operating by hand is possible.

can these be use by hand twisting on brass jets in carburetors to enlarge the one increiment at a time?

I'm going to say yes. I twist them by hand, but I should also mention that I'm drilling into wood. I build model ships. Drilling into brass might be possible, but be aware that these bits, although very effective drilling into wood, are very brittle. I can't tell you how many have snapped on me when I least suspect it and I have to break out another set. I've learned to drill carefully and with patience. Other than that, I do like these bits and have started using them in my Dremel.

Are these recommended for drilling into raw semi-precious stones (like Crystal Quartz, amethyst, agate etc) for the purpose of creating pendant holes?

No. You really need a diamond bit or hole saw, depending on the size. You'll also want to have a water drip going or at least use some sort of lubricant such as beeswax or gem lube.

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50pcs PCB Drill Bits Set Spiral Flute Carbide 0.3mm-1.2mm for Print Circuit Board Stone Dremel Jewelry CNC Engraving (5PCS Each)

50pcs PCB Drill Bits Set Spiral Flute Carbide 0.3mm-1.2mm for Print Circuit Board Stone Dremel Jewelry CNC Engraving (5PCS Each)

Product ID: 136244978

Details

Brand
WayinTop
Cutting Diameter
1.2
Finish Type
Steel
Material
Tungsten Steel
Shank Type
Straight

💎Tungsten steel, ultra-hard & wear-resistant

🔄Spiral flute for clean, glitch-free cuts

⚙️50 precision bits, 10 sizes

€ 34.25

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Drill Like a Pro, Finish Like a Boss

BUILT TO LAST - Crafted from tungsten steel for unmatched hardness and wear resistance
MULTI MATERIAL MASTERY - Perfect for PCB, stone, jewelry, CNC engraving, and more
PRECISION IN EVERY DRILL - 10 sizes from 0.3mm to 1.2mm, 5 pieces each for flawless versatility
FLAWLESS FINISH EVERY TIME - Spiral flute design ensures clean cuts with zero scrap or glitches
READY TO GO READY TO PROTECT - Comes in a durable plastic case for easy transport and tip protection

The WayinTop 50pcs PCB Drill Bits Set features 10 sizes ranging from 0.3mm to 1.2mm, each with 5 high-precision tungsten steel bits. Designed with spiral flutes for clean, efficient drilling across materials like circuit boards, stone, and jewelry, this set combines durability and versatility in a protective carry case—ideal for professionals demanding flawless results.

Specifications

ASIN	B07S636JHY
Best Sellers Rank	#26,402 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Circuit Board Drill Bits #553 in Drill Bits
Brand Name	WayinTop
Customer Reviews	4.4 4.4 out of 5 stars (1,802)
Cutting Diameter	1.2 Millimeters
Finish Types	Steel
Item Dimensions	3.94 x 1.97 x 0.2 inches
Item Weight	185 Grams
Manufacturer	WayinTop
Material Type	Tungsten Steel
Minimum Bore Diameter	0.3 Millimeters
Model	WYTP21
Number of Flutes	3
Number of Pieces	50
Part Number	WYTP21
Point Style	Spear Point
Set Name	PCB Drill Bits Set
Shank Type	Straight
Surface Recommendation	Steel,Stone
Tool Flute Type	Spiral
UPC	713871273991 713871270419
Unit Count	50.0 Count

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TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

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€ 34.25

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Belgium.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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